Comparison between a silorane-based composite and methacrylate-based composites: Shrinkage characteristics, thermal properties, gel point and vitrification point

Abstract

A silorane-based composite was compared against methacrylate-based composites in terms of shrinkage characteristics, thermal properties, gel point, and vitrification point. Shrinkage strain was measured using a laser triangulation method. Shrinkage stress was measured using a stress analyzer. Heat flow during photopolymerization was measured using photo-DSC. Statistical analysis was performed using one-way ANOVA and Tukey's test (p=0.05). Silorane exhibited significantly lower shrinkage strain than the methacrylate-based composites. It also presented the lowest stress values during light exposure, but the highest maximum stress rate after light exposure. It showed the highest heat flow rate, and it took the longest time to reach gel and vitrification points. Silorane demonstrated improved performance over the methacrylate-based composites with delayed gel and vitrification points as well as reduced shrinkage strain and stress. However, a high quantity of heat was liberated during the curing process, causing silorane to show significantly higher stress rate (p<0.05) than the methacrylate-based composites after light exposure.

Mechanical properties, shrinkage stress, cuspal strain and fracture resistance of molars restored with bulk-fill composites and incremental filling technique

“…During polymerization, the composite changes from a predominantly viscous to a predominantly solid substance, which can be characterized by the development of the elastic modulus (E) [14]. Residual shrinkage stresses can be created when volumetric polymerization contraction is accompanied by this E development and the surrounding tooth structure restricts the volumetric changes [12,44]. Composite resins with high elastic modulus produce more rigid restorations, which increase the effect of polymerization contraction on residual shrinkage stresses [35].…”

“…Composite resin composition and filling techniques are among the primary approaches to reduce volumetric contraction and shrinkage stress development [11,12].…”

Incremental Filling Technique and Composite Material—Part II: Shrinkage and Shrinkage Stresses

“…5,6 Changes in material formulations and filling techniques, aimed at reducing volumetric contraction and shrinkage stress, have been the primary approaches for reducing the development of residual stresses. 7,8 Restorative composite formulations have been continuously improved by modifying filler content 9 and monomer types. 10 Silorane-based composites were developed to minimize the polymerization contraction.…”

The Influence of Zinc Oxide Eugenol (ZOE) and Glass Ionomer (GI) Base Materials on the Microhardness of Various Composite and GI Restorative Materials

“…Even the basic matrix material has been changed with the release of Silorane (epoxides system- oxirane) by 3M/ESPE [12]. …”